Interesting, I had never seen the "CB" designation on the Mk.32 Mod.2 mount pamphlet. It's entirely possible different mounts were used in different locations (or maybe different mounts on CB-1 vs. CB-2... what a headache). What makes the call even more difficult is how easy the blast hoods were to remove - maybe they did just choose to remove them on a few. I think at this point it becomes a matter of personal preference. On my drawings I depicted the Mod.4 mounts (with no blast hoods) because photo evidence at least tends to gravitate towards that. But I don't think anyone can call your model "wrong" for showing the mounts with them, especially since we now have actual evidence of the hoods at least being a possibility on each ship!
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As to not being used in the Pacific heat, the Iowa's which spent most of their WWII careers in the Pacific did use them, given the close packing and super firing aspect of the upper mounts on the lower it is apparent that with the exception of the mounts under the bridge wings, they would be quite helpful. I suppose that the hoods also provided some minor splinter protection, otherwise the 52 and 53-54 mounts on a Fletcher would not need them? Some sun and rain protection as well?
Oh, my comment about the heat was just directed at how the photos show the batteries with the hatches open all the time. I imagine the gun crews would probably crack them open whenever possible to vent the hot air out the top of the mount.
None of this detracts from what is an incredible model so far - looking forward to the finished product!
edit: Also, unrelated, but I made
this reference sheet to help with getting everything right during the drawing process. It may or may not help modellers but here it is anyway.